The Manafort conviction was the first courtroom test for Mueller's probe, while Cohen implicated the president in admitting to making payments during the 2016 election to tamp down on claims from two women who claim they had affairs with Trump in 2006.

"I'm glad that he's doing what he's doing. And doing it professionally, Mueller. And we need to allow him to continue to serve," Flake said.

"I hope that the president doesn't take any action that would impede that, I hope that he quits trying to undermined that investigation, if he's not worried about the what the conclusion is then let it take its course,” he added.

The retiring Arizona senator said he “hopes” the Senate will consider a Judiciary Committee-backed bill that would make it more difficult to fire the special counsel.

"I don't feel any concern right now and if I feel concern, I will let you know,” Graham said.

"I haven't seen any threat to it at this point other than rhetoric by some, so my view remains the same and that is that probe should continue and it should be allowed to complete itself … I think it's in the best interest of everyone including the president,” Rubio told reporters.

Democrats have continued to voice concerns that Trump will attempt to end Mueller’s probe into his campaign associates’ ties with Russia, saying the special counsel is still gathering information about those connected to the campaign.

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An attorney representing a group of landowners suing over the President Trump's national emergency declaration said Thursday that some could lose their homes or the ability to access their property if a wall goes up on the U.S.-Mexico border.

Former acting Director of U.S. Immigration and Customs Enforcement (ICE) John Sandweg on Thursday said that the border wall is not a “moral issue,” but rather an “important tool” to help with border security.